Adjustment for telescopes.



H. BAUSGH.

ADJUSTMENT FOR TELESOOPES. APPLICATION FILED 00T. 1o, 11106.`

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ADJUSTMENT Pon TELEsGoPEs.

APPLIOATION FILED 00T. 10, 1905.

Patented Nov. 15, 1910.

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HENRY Benson, E ROCHESTER, NEw YORK, AssIeNomBv NEsNE ASSIGNMENTS, To 4 BaUscH e EOMB OPTICAL COMPANY, (No. 2,) .a CORPORATION or NEW Yoan.

ADJUSTMENT Eon TELEscoPEs.

ASlgrecication of Letters Patent.

rarement New. is, raie..

Application filed October 10, 1905. Serial No. 282.089.

T o all whom 'it may concern:

` Be it known that I, HENRY BAUSCH, of

l Rochester, in the county of Monroe and State of New York, L have invented certain new and useful Improvements 1n Adjustments for Telescopes; and I do hereby declare the following to be a full, clear, and

exact description of the saine, reference bef ing had ,to the accompan ing drawings,

and the lens elements of the main tube will.

be maintained accuratelyin alinement at all relative adjustments of the tube 'and eyepiece. p u

- To these and other ends my invention consists in certain improvements and combi` nations of and arrangements of parts to be hereinafter described, the novel features being pointed out particularly in the claims hereunto annexed.

In the drawing: Figure l is a sectibnal view of a telescope draw tube, showing my invention applied thereto. Fig. 2 is a-view similar to Fig. l, the eyepiece being shown partially withdrawn from the tube. l Fig. 3 represents` a section on the line 3 3 'of Fig. 2. Fig. l represents a section on the line -4--4 of Fig. 2, and Fig. 5 is a sectional view of a telescope, showing my improvements applied thereto. v

The same numerals designate similar parts in the several views.

Although my invention is applicable generally to optical instruments of 'various `kinds requiring a'lens adjustment for focusing purposes, it is particularly' adapted to the ne adjustment for the eyepieces of telescopes, and in the accompanying drawings it has been so shown, ll designating the rear draw tube of a telescope 2,' the' telescope tubes being provided with the usual' lens elements arranged with their optical axes inalinement.. Atthe rear end of the tube 1 is Ytted a non-revoluble sleeve 3 having a slot 4 formed therein and arranged axially of the telescope, and a revoluble sleeve 5 is itted Within sleeve 3, an annular shoulder 6 being formed at one end and a rim 7 at the opposite end to cooperate with the respective ends of outer sleeve 3 yto prevent relative axial mot-ion, the rim 7 being preferably formed to serve as an operating ring for the operators fingers. The revoluble sleeve 5 has 'a helical slot or caln 8 formed in its walls, and resting inthe slots l and 8 respectively of the outer and inner sleeves is a screw or radial projection 9 carried by the eyepiece tube 10the latter being movable axially of the inner sleeve 5, and provided with the lenses comprising the lens system of the eyepiece. f

By such construction and arrangement, the projection 9 of the eyepiece tube will engage in the axially-arranged slot lof the nonrevolublesleeve 3 to prevent rotation of the eyepiece tube and permit it to move axially of the telescope, and as this projection coperates with the cam slot S of the revoluble sleeve 5, rotation of the latter will reciprocate the projection 9 longitudinally Y lof slot 4, causing the tube ot the eyepiece to movein 'a direction axially of the sleeves.

Thus it will be understood. that the telescope eyepiece does not revolve but has only an axial motion with respect to the telescope, and therefore-when' the lenses of the system have been once mounted with their optical axes in alinement, their centers will be accurately maintained in alinement at all adjustments of the eyepiece, as the latter-moves precisely in the line of the lens centers, and this is' particularly important in transits, and other instru-ments employed for accurately measuring angles, distances, etc., wherein it is essential that the optical axis of the telescope should be perfectl)y maintainedd relatively to the mounting and its scales, for it will be understood that deviations in the opticalfaxis of the telescope would introduce errors into the readings of the instrument.

I claim as my invention:

1. rI`he combination with a telescope. ota non-rotatable eyepiece mounted to operate longitudinally thereof, a. rotatable adjusting device surrounding the eyepiece for operating it and a guiding portion surrounding the adjusting device and .adapted for attachmentto the telescope.

2. In a telescope, the combination with the tube or casing, and a longitudinally movable eyepiece carried thereby, of an attaching portion Withinl the telescope tubel for pre-l venting rotation` of the eyepiece', and a rotatable adjusting device Working within said attaching portion ffor moving the eyepiece longitudinally of the telescope.-

3. The combination With ya telescopephaving a portion extending into the telescope tube and provided With an'axially arranged slot, and an eyepiece' having afprojection thereonl'coperating -With sald slot, of an adjusting `device 'inclosed Within said portion for operating-the eyepiece axially ofl the telescope'.4

4. The'combination With'a telescope Vhav-y ingA .a sleeve suitably attached thereto and .provided Withfan laxially-arranged slot, and

an eyepiece having a projection coperating 'With said slot, of a rotatable adjusting de- /vice inclosed by ysaid vsleeve/ and having a cam thereon coperating with the projection. of the e epiece for adjusting: the 'latter axially o the telescope.

5. The combination `vvitha telescope, a

prtionadapted to be attached thereto and provided with an axially-arranged slot, and v,

an eyepiece having a projection coperating with saidslot, ofl a rotatable adjusting device fittedl to operate lWithin thejsaid attaching( portion and Yhaving .a helical slot c ooperating With .the projection of `the eyepiece for adjusting thelatter axially of the telescope.

6. The combination with a telescope, of a Inon-rotatable sleeve carried thereby proarrangedy axially offthe telescope, a non-v rgntatarbleeyepiece having -a projection cooperating with the said slot, and a rotatable a justing device journaled to turn in said sleeve for moving the eyepiece axially of the telescope. A

HENRY BAU-SCH. Witnesses: v

WM. L. PATTERSON, WILLIAM V. Moolen. 

